Force Table Scan Syntax
SELECT memberID, fname, lname
FROM members WITH (INDEX(0))
WHERE dept_cd = 100


SELECT dept_name, memberID, fname, lname
FROM members WITH (INDEX(0))
,department WITH (INDEX(0))
WHERE members.dept_cd = department.dept_cd


By the way, some DBAs are not aware of this (force table scan). I’m not a DBA but I worked on a lot of performance optimization projects before and has always been working with our DBAs. Their usual advice is to use the index which is correct in most cases. However, I think some of our queries should have use a force table scan to be more efficient.

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Syntax


IFNULL(expr1,expr2)


Usage

If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2. Take note that IFNULL() returns a numeric or string value, depending on the context in which it is used. I haven’t used it for other data types yet but I reckon it would have the same results. That is to return the same data type as that of expr1. Another important thing to remember is that expr1 and expr2 should have the same data type

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